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Pronunciation

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Singular
alien

Plural
aliens

 
An artist's idea of an alien.
  1. (countable) An alien is a person, animal, plant or thing that is not part of the group you look at.
  2. (countable) An alien is a person who lives in a foreign country.
  1. (countable) An alien is a living thing that is not from earth.
    Nobody has ever seen an alien.

Adjective

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Positive
alien

Comparative
more alien

Superlative
most alien

  1. If something is alien, it is strange or unfamiliar to you.